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Cool stuff. I'm gunna hit google now and find out how a .357 caliber bullet came to be known as a "thirty eight"...

Standard bore diameter is usually measured from land to land. Some manufacturers decided to measure from land to groove or groove to groove in order to make their product appear "bigger" and therefore more appealing. Both a .38 and .357 bullet will both fit in the same bore, however one is measured differently from the other.

"A few well placed shots with a .22LR is a lot better than a bunch of solid misses with a .44 mag!" Glock Armorer, NRA Chief RSO, Pistol, Rifle, Shotgun, Muzzleloading Rifle, Muzzleloading Shotgun, and Home Firearm Safety Training Counselor